Process for making basic sulfate of lead.



1 citizen of the United States, residing at} Hollidaysburg, in-the county-of Blair and"! State of Pennsylvania, haveinvented acer- Basic Sulfate of Lead, whereof the follow- I'INI ED STATES I PATENT orries.

ALBERT HILEMAN, or HOLLIDAYSZBURG,' PENNSYLVANIA,- AssIGNoR TO HARRISON BROS. & co, INC., on PHILADELPHIA, PENNSYLVANIA, A conronArIoN or PENN- SYLVANIA.

inoonss you MAKING BASIC S LFATE or LIFAD.

NoDrawing.

Specification o i' iictters Patent. application and April 24, 907. Serial No. 870,084;

. Patented Sept. .56, 1.910.

To all iuhom it may concern: c I Be it known that I, ALnEn'r' HILEMAN, a

tain new and useful Process for. Making ing is a specification.

The object of my invention is to obtain a basic su'lfate of lead from normalsulfate of lead, which has been previously obtained by any desired. process. The normal sulfate is, of course,.a product well known in the arts, and readily obtainable, whereas, the proc esses heretofore employedin the manufacture of basic sulfate involved considerable detail and expense. -My invention is based u on the discov,

I cry that under certain con itions, 'adirect combination can be brought about between normal sulfate of lead and oxid of lead-- (litharge), by a process in which chemical, and possibly electrochemical, actions'o'f a somewhat obscure nature, are induced or modified by mechanical treatment;

I have found that when an intimate mix- I ture: of normal leadsulfate and litharge is actively boiled together, with a considerable volume of water, '(althou h neither, of the solid ingredients ,is soluble to any substantial extent) a combination between the two ingredients readily takes place. I believe this action to be due'to" a-progressivedissociation of the individual lead salts and their progressive reunion into a new comound; this action taking place readily under the conditions-- designated, although manifest to little or no extent in the absence of heat and agitation. I

I take say 100 parts of normal sulfate of lead, and 75 parts of litharge, both of the water, say 500 parts, and .the water'is maintained at a boiling temperature while the mass is actively stirred until the yellow color e htharge disappears and the color in- {dic'ative of basic sulfate is attained, showing The above formula is given as atypical I one, but without intention to .lim'itjthe proc-' ess thereto, since: in practice the amounts of the respectiveangredients may be yaried to produce the desired degree offbasicity' in' the final product. I am' aware that it is not new to employa solution of acetate of lead in connect1on with roasted lead ore, and to subsequently treat the resultant product by means of carbonic acid. This method however, difiers essentially from my process, in that the acetate of lead is wholly soluble'a'nd is utilized in the form of such a solution. The peculiarity of my proccssresidcs in the fact that although neither of the ingredients is sub stantiallysolublc in the hot aqueous medium,

the desired combination can be brought about by the progressive actlon above described. p Ilaving 'thus described my invention, I

clann:--

The hereinbefore described process of making basic sulfate of lead which consists in chemically combining normal sulfatep-oflead with litharge, by agitating siiid'ilim gredients in a substantially undissolvedcondition, in the presence of a hot liquid, substantially as set forth.

In testimony .whereof, I have hereunto signed my name, at Philadelphia, Pennsyl- Vania this twenty-third ddy of A ril 1907.

=ALBERT HIL MAN. 1 Witnesses:

-, FRANK Sruaur CAYENS,

JAMES H. BELL. 

